Title (en)

Phosphonic acid/phosphate mixtures for controlling corrosion of metal and inhibiting calcium salt precipitation in aqueous systems.

Title (de)

Gemisch eines Phosphats und einer Phosphonsäure zur Inhibierung von Metallkorrosionen und von Kalziumsalzausfällung in wässerigen Systemen.

Title (fr)

Mélange d'un phosphate et d'un acide phosphonique pour inhiber la corrosion de métaux et la précipitation de sels de calcium dans des systèmes aqueux.

Publication

EP 0242229 A1 19871021 (EN)

Application

EP 87303423 A 19870416

Priority

US 85361286 A 19860418

Abstract (en)

A method of controlling the corrosion of a metal surface in contact with an aqueous system while at the same time preventing the precipitation of potentially scale-forming calcium salts such as calcium phosphate, comprises treating the system with a source of orthophosphate ion and a mixture of methylene phosphonic acid derivatives of C6 diamines, or the salts thereof.

IPC 1-7

C23F 11/08

IPC 8 full level

C02F 5/00 (2006.01); C02F 5/08 (2006.01); C02F 5/10 (2006.01); C02F 5/12 (2006.01); C02F 5/14 (2006.01); C23F 11/08 (2006.01); C23F 11/167 (2006.01); C23F 11/18 (2006.01)

CPC (source: EP US)

C02F 5/145 (2013.01 - EP US); C23F 11/08 (2013.01 - EP US); C23F 14/02 (2013.01 - EP US)

Citation (search report)

• [A] LU 68346 A1 19731112
• [A] FR 2293498 A1 19760702 - CHEMED CORP [US]
• [A] FR 1598044 A 19700629

Designated contracting state (EPC)

BE DE ES FR GB IT NL SE

DOCDB simple family (publication)

US 4671934 A 19870609; AU 588192 B2 19890907; AU 7111387 A 19871022; CA 1286490 C 19910723; DE 3760624 D1 19891102; EP 0242229 A1 19871021; EP 0242229 B1 19890927; ES 2012482 B3 19900401; JP 2592822 B2 19970319; JP S62256973 A 19871109; MX 164115 B 19920717; ZA 87242 B 19870930

DOCDB simple family (application)

US 85361286 A 19860418; AU 7111387 A 19870406; CA 526578 A 19861231; DE 3760624 T 19870416; EP 87303423 A 19870416; ES 87303423 T 19870416; JP 3768287 A 19870220; MX 519287 A 19870210; ZA 87242 A 19870114